[PATCH] ide-floppy adjustments

[PATCH] ide-floppy adjustments

[Jan Beulich]

[-- Attachment #1: Type: text/plain, Size: 1771 bytes --]

(Note: Patch also attached because the inline version is certain to get
line wrapped.)

Fix a build problem when IDEFLOPPY_DEBUG_BUGS is turned off, and eliminate
an access to memory that is no longer allocated (causing systems to fail
booting when CONFIG_DEBUG_PAGEALLOC is turned on).

Signed-off-by: Jan Beulich <jbeulich@novell.com>

diff -Npru linux-2.6.12-rc4.base/drivers/ide/ide-floppy.c linux-2.6.12-rc4/drivers/ide/ide-floppy.c
--- linux-2.6.12-rc4.base/drivers/ide/ide-floppy.c	2005-05-11 17:27:57.385469928 +0200
+++ linux-2.6.12-rc4/drivers/ide/ide-floppy.c	2005-05-11 17:50:36.267888400 +0200
@@ -661,10 +661,12 @@ static void idefloppy_output_buffers (id
 
 	idefloppy_do_end_request(drive, 1, done >> 9);
 
+#if IDEFLOPPY_DEBUG_BUGS
 	if (bcount) {
 		printk(KERN_ERR "%s: leftover data in idefloppy_output_buffers, bcount == %d\n", drive->name, bcount);
 		idefloppy_write_zeros(drive, bcount);
 	}
+#endif
 }
 
 static void idefloppy_update_buffers (ide_drive_t *drive, idefloppy_pc_t *pc)
@@ -1048,6 +1050,9 @@ static ide_startstop_t idefloppy_issue_p
 	atapi_bcount_t bcount;
 	ide_handler_t *pkt_xfer_routine;
 
+#if 0 /* Accessing floppy->pc is not valid here, the previous pc may be gone
+         and have lived on another thread's stack; that stack may have become
+         unmapped meanwhile (CONFIG_DEBUG_PAGEALLOC). */
 #if IDEFLOPPY_DEBUG_BUGS
 	if (floppy->pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD &&
 	    pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD) {
@@ -1055,6 +1060,7 @@ static ide_startstop_t idefloppy_issue_p
 			"Two request sense in serial were issued\n");
 	}
 #endif /* IDEFLOPPY_DEBUG_BUGS */
+#endif
 
 	if (floppy->failed_pc == NULL &&
 	    pc->c[0] != IDEFLOPPY_REQUEST_SENSE_CMD)



[-- Attachment #2: linux-2.6.12-rc4-idefloppy.patch --]
[-- Type: text/plain, Size: 1724 bytes --]

(Note: Patch also attached because the inline version is certain to get
line wrapped.)

Fix a build problem when IDEFLOPPY_DEBUG_BUGS is turned off, and eliminate
an access to memory that is no longer allocated (causing systems to fail
booting when CONFIG_DEBUG_PAGEALLOC is turned on).

Signed-off-by: Jan Beulich <jbeulich@novell.com>

diff -Npru linux-2.6.12-rc4.base/drivers/ide/ide-floppy.c linux-2.6.12-rc4/drivers/ide/ide-floppy.c
--- linux-2.6.12-rc4.base/drivers/ide/ide-floppy.c	2005-05-11 17:27:57.385469928 +0200
+++ linux-2.6.12-rc4/drivers/ide/ide-floppy.c	2005-05-11 17:50:36.267888400 +0200
@@ -661,10 +661,12 @@ static void idefloppy_output_buffers (id
 
 	idefloppy_do_end_request(drive, 1, done >> 9);
 
+#if IDEFLOPPY_DEBUG_BUGS
 	if (bcount) {
 		printk(KERN_ERR "%s: leftover data in idefloppy_output_buffers, bcount == %d\n", drive->name, bcount);
 		idefloppy_write_zeros(drive, bcount);
 	}
+#endif
 }
 
 static void idefloppy_update_buffers (ide_drive_t *drive, idefloppy_pc_t *pc)
@@ -1048,6 +1050,9 @@ static ide_startstop_t idefloppy_issue_p
 	atapi_bcount_t bcount;
 	ide_handler_t *pkt_xfer_routine;
 
+#if 0 /* Accessing floppy->pc is not valid here, the previous pc may be gone
+         and have lived on another thread's stack; that stack may have become
+         unmapped meanwhile (CONFIG_DEBUG_PAGEALLOC). */
 #if IDEFLOPPY_DEBUG_BUGS
 	if (floppy->pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD &&
 	    pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD) {
@@ -1055,6 +1060,7 @@ static ide_startstop_t idefloppy_issue_p
 			"Two request sense in serial were issued\n");
 	}
 #endif /* IDEFLOPPY_DEBUG_BUGS */
+#endif
 
 	if (floppy->failed_pc == NULL &&
 	    pc->c[0] != IDEFLOPPY_REQUEST_SENSE_CMD)