mtd: Make MTD tests cancelable

I always go nuts when I start an MTD test on a slow device and have to
wait forever until it finishes. From the debug output I already know
what the issue is but I have to wait or reset the board hard. Resetting
is often not an option (remote access, you don't want lose the current
state, etc...).

The solution is easy, check for pending signals at key positions in the
code. Using that one can even stop a test by pressing CTRL-C as
insmod/modprobe have SIGINT pending.

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

10 files changed, 120 insertions, 24 deletions

diff --git a/drivers/mtd/tests/mtd_nandecctest.c b/drivers/mtd/tests/mtd_nandecctest.c
index e579f9027c47..79316159eec6 100644
--- a/drivers/mtd/tests/mtd_nandecctest.c
+++ b/drivers/mtd/tests/mtd_nandecctest.c
@@ -9,6 +9,8 @@
 #include <linux/slab.h>
 #include <linux/mtd/nand_ecc.h>
 
+#include "mtd_test.h"
+
 /*
  * Test the implementation for software ECC
  *
@@ -274,6 +276,10 @@ static int nand_ecc_test_run(const size_t size)
 		}
 		pr_info("ok - %s-%zd\n",
 			nand_ecc_test[i].name, size);
+
+		err = mtdtest_relax();
+		if (err)
+			break;
 	}
 error:
 	kfree(error_data);
diff --git a/drivers/mtd/tests/mtd_test.h b/drivers/mtd/tests/mtd_test.h
index f437c776c54f..4b7bee17c924 100644
--- a/drivers/mtd/tests/mtd_test.h
+++ b/drivers/mtd/tests/mtd_test.h
@@ -1,4 +1,16 @@
 #include <linux/mtd/mtd.h>
+#include <linux/sched.h>
+
+static inline int mtdtest_relax(void)
+{
+	cond_resched();
+	if (signal_pending(current)) {
+		pr_info("aborting test due to pending signal!\n");
+		return -EINTR;
+	}
+
+	return 0;
+}
 
 int mtdtest_erase_eraseblock(struct mtd_info *mtd, unsigned int ebnum);
 int mtdtest_scan_for_bad_eraseblocks(struct mtd_info *mtd, unsigned char *bbt,
diff --git a/drivers/mtd/tests/nandbiterrs.c b/drivers/mtd/tests/nandbiterrs.c
index 273f7e553954..09a4ccac53a2 100644
--- a/drivers/mtd/tests/nandbiterrs.c
+++ b/drivers/mtd/tests/nandbiterrs.c
@@ -320,6 +320,10 @@ static int overwrite_test(void)
 			break;
 		}
 
+		err = mtdtest_relax();
+		if (err)
+			break;
+
 		opno++;
 	}
 
diff --git a/drivers/mtd/tests/oobtest.c b/drivers/mtd/tests/oobtest.c
index c6b35644a10f..8e8525f0202f 100644
--- a/drivers/mtd/tests/oobtest.c
+++ b/drivers/mtd/tests/oobtest.c
@@ -112,7 +112,10 @@ static int write_whole_device(void)
 			return err;
 		if (i % 256 == 0)
 			pr_info("written up to eraseblock %u\n", i);
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			return err;
 	}
 	pr_info("written %u eraseblocks\n", i);
 	return 0;
@@ -318,7 +321,10 @@ static int verify_all_eraseblocks(void)
 			return err;
 		if (i % 256 == 0)
 			pr_info("verified up to eraseblock %u\n", i);
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			return err;
 	}
 	pr_info("verified %u eraseblocks\n", i);
 	return 0;
@@ -429,7 +435,10 @@ static int __init mtd_oobtest_init(void)
 			goto out;
 		if (i % 256 == 0)
 			pr_info("verified up to eraseblock %u\n", i);
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	pr_info("verified %u eraseblocks\n", i);
 
@@ -642,7 +651,11 @@ static int __init mtd_oobtest_init(void)
 				goto out;
 			if (i % 256 == 0)
 				pr_info("written up to eraseblock %u\n", i);
-			cond_resched();
+
+			err = mtdtest_relax();
+			if (err)
+				goto out;
+
 			addr += mtd->writesize;
 		}
 	}
@@ -680,7 +693,10 @@ static int __init mtd_oobtest_init(void)
 		}
 		if (i % 256 == 0)
 			pr_info("verified up to eraseblock %u\n", i);
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	pr_info("verified %u eraseblocks\n", i);
 
diff --git a/drivers/mtd/tests/pagetest.c b/drivers/mtd/tests/pagetest.c
index 88296e888e9d..ba1890d5632c 100644
--- a/drivers/mtd/tests/pagetest.c
+++ b/drivers/mtd/tests/pagetest.c
@@ -407,7 +407,10 @@ static int __init mtd_pagetest_init(void)
 			goto out;
 		if (i % 256 == 0)
 			pr_info("written up to eraseblock %u\n", i);
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	pr_info("written %u eraseblocks\n", i);
 
@@ -422,7 +425,10 @@ static int __init mtd_pagetest_init(void)
 			goto out;
 		if (i % 256 == 0)
 			pr_info("verified up to eraseblock %u\n", i);
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	pr_info("verified %u eraseblocks\n", i);
 
diff --git a/drivers/mtd/tests/readtest.c b/drivers/mtd/tests/readtest.c
index a54cf1511114..a3196b750a22 100644
--- a/drivers/mtd/tests/readtest.c
+++ b/drivers/mtd/tests/readtest.c
@@ -190,7 +190,10 @@ static int __init mtd_readtest_init(void)
 			if (!err)
 				err = ret;
 		}
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 
 	if (err)
diff --git a/drivers/mtd/tests/speedtest.c b/drivers/mtd/tests/speedtest.c
index a77019cb5510..5a6f31af06f9 100644
--- a/drivers/mtd/tests/speedtest.c
+++ b/drivers/mtd/tests/speedtest.c
@@ -269,7 +269,10 @@ static int __init mtd_speedtest_init(void)
 		err = write_eraseblock(i);
 		if (err)
 			goto out;
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	stop_timing();
 	speed = calc_speed();
@@ -284,7 +287,10 @@ static int __init mtd_speedtest_init(void)
 		err = read_eraseblock(i);
 		if (err)
 			goto out;
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	stop_timing();
 	speed = calc_speed();
@@ -303,7 +309,10 @@ static int __init mtd_speedtest_init(void)
 		err = write_eraseblock_by_page(i);
 		if (err)
 			goto out;
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	stop_timing();
 	speed = calc_speed();
@@ -318,7 +327,10 @@ static int __init mtd_speedtest_init(void)
 		err = read_eraseblock_by_page(i);
 		if (err)
 			goto out;
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	stop_timing();
 	speed = calc_speed();
@@ -337,7 +349,10 @@ static int __init mtd_speedtest_init(void)
 		err = write_eraseblock_by_2pages(i);
 		if (err)
 			goto out;
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	stop_timing();
 	speed = calc_speed();
@@ -352,7 +367,10 @@ static int __init mtd_speedtest_init(void)
 		err = read_eraseblock_by_2pages(i);
 		if (err)
 			goto out;
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	stop_timing();
 	speed = calc_speed();
@@ -385,7 +403,11 @@ static int __init mtd_speedtest_init(void)
 			err = multiblock_erase(i, j);
 			if (err)
 				goto out;
-			cond_resched();
+
+			err = mtdtest_relax();
+			if (err)
+				goto out;
+
 			i += j;
 		}
 		stop_timing();
diff --git a/drivers/mtd/tests/stresstest.c b/drivers/mtd/tests/stresstest.c
index d90c1c01dac6..e509f8aa9a7e 100644
--- a/drivers/mtd/tests/stresstest.c
+++ b/drivers/mtd/tests/stresstest.c
@@ -221,7 +221,10 @@ static int __init mtd_stresstest_init(void)
 		err = do_operation();
 		if (err)
 			goto out;
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	pr_info("finished, %d operations done\n", op);
 
diff --git a/drivers/mtd/tests/subpagetest.c b/drivers/mtd/tests/subpagetest.c
index 0b835c631f91..aecc6ce5a9e1 100644
--- a/drivers/mtd/tests/subpagetest.c
+++ b/drivers/mtd/tests/subpagetest.c
@@ -269,7 +269,10 @@ static int verify_all_eraseblocks_ff(void)
 			return err;
 		if (i % 256 == 0)
 			pr_info("verified up to eraseblock %u\n", i);
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			return err;
 	}
 	pr_info("verified %u eraseblocks\n", i);
 	return 0;
@@ -346,7 +349,10 @@ static int __init mtd_subpagetest_init(void)
 			goto out;
 		if (i % 256 == 0)
 			pr_info("written up to eraseblock %u\n", i);
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	pr_info("written %u eraseblocks\n", i);
 
@@ -360,7 +366,10 @@ static int __init mtd_subpagetest_init(void)
 			goto out;
 		if (i % 256 == 0)
 			pr_info("verified up to eraseblock %u\n", i);
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	pr_info("verified %u eraseblocks\n", i);
 
@@ -383,7 +392,10 @@ static int __init mtd_subpagetest_init(void)
 			goto out;
 		if (i % 256 == 0)
 			pr_info("written up to eraseblock %u\n", i);
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	pr_info("written %u eraseblocks\n", i);
 
@@ -398,7 +410,10 @@ static int __init mtd_subpagetest_init(void)
 			goto out;
 		if (i % 256 == 0)
 			pr_info("verified up to eraseblock %u\n", i);
-		cond_resched();
+
+		err = mtdtest_relax();
+		if (err)
+			goto out;
 	}
 	pr_info("verified %u eraseblocks\n", i);
 
diff --git a/drivers/mtd/tests/torturetest.c b/drivers/mtd/tests/torturetest.c
index 5045cf1b3160..e5d6e6d9532f 100644
--- a/drivers/mtd/tests/torturetest.c
+++ b/drivers/mtd/tests/torturetest.c
@@ -279,7 +279,10 @@ static int __init tort_init(void)
 					       " for 0xFF... pattern\n");
 					goto out;
 				}
-				cond_resched();
+
+				err = mtdtest_relax();
+				if (err)
+					goto out;
 			}
 		}
 
@@ -294,7 +297,10 @@ static int __init tort_init(void)
 			err = write_pattern(i, patt);
 			if (err)
 				goto out;
-			cond_resched();
+
+			err = mtdtest_relax();
+			if (err)
+				goto out;
 		}
 
 		/* Verify what we wrote */
@@ -314,7 +320,10 @@ static int __init tort_init(void)
 					       "0x55AA55..." : "0xAA55AA...");
 					goto out;
 				}
-				cond_resched();
+
+				err = mtdtest_relax();
+				if (err)
+					goto out;
 			}
 		}