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authorLinus Torvalds <torvalds@linux-foundation.org>2012-07-18 18:15:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-18 18:15:46 -0700
commiteea03c20ae38a55405c0865ed9adfccc400e4c8e (patch)
tree09800af230cd1ef6d9d83ac5e057d8085feca601 /kernel
parente2f3b78557ff11f58d836e016900c3210f4fb1c1 (diff)
downloadlwn-eea03c20ae38a55405c0865ed9adfccc400e4c8e.tar.gz
lwn-eea03c20ae38a55405c0865ed9adfccc400e4c8e.zip
Make wait_for_device_probe() also do scsi_complete_async_scans()
Commit a7a20d103994 ("sd: limit the scope of the async probe domain") make the SCSI device probing run device discovery in it's own async domain. However, as a result, the partition detection was no longer synchronized by async_synchronize_full() (which, despite the name, only synchronizes the global async space, not all of them). Which in turn meant that "wait_for_device_probe()" would not wait for the SCSI partitions to be parsed. And "wait_for_device_probe()" was what the boot time init code relied on for mounting the root filesystem. Now, most people never noticed this, because not only is it timing-dependent, but modern distributions all use initrd. So the root filesystem isn't actually on a disk at all. And then before they actually mount the final disk filesystem, they will have loaded the scsi-wait-scan module, which not only does the expected wait_for_device_probe(), but also does scsi_complete_async_scans(). [ Side note: scsi_complete_async_scans() had also been partially broken, but that was fixed in commit 43a8d39d0137 ("fix async probe regression"), so that same commit a7a20d103994 had actually broken setups even if you used scsi-wait-scan explicitly ] Solve this problem by just moving the scsi_complete_async_scans() call into wait_for_device_probe(). Everybody who wants to wait for device probing to finish really wants the SCSI probing to complete, so there's no reason not to do this. So now "wait_for_device_probe()" really does what the name implies, and properly waits for device probing to finish. This also removes the now unnecessary extra calls to scsi_complete_async_scans(). Reported-and-tested-by: Artem S. Tashkinov <t.artem@mailcity.com> Cc: Dan Williams <dan.j.williams@gmail.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: James Bottomley <jbottomley@parallels.com> Cc: Borislav Petkov <bp@amd64.org> Cc: linux-scsi <linux-scsi@vger.kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/power/hibernate.c8
-rw-r--r--kernel/power/user.c2
2 files changed, 0 insertions, 10 deletions
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 8b53db38a279..238025f5472e 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -27,7 +27,6 @@
#include <linux/syscore_ops.h>
#include <linux/ctype.h>
#include <linux/genhd.h>
-#include <scsi/scsi_scan.h>
#include "power.h"
@@ -748,13 +747,6 @@ static int software_resume(void)
async_synchronize_full();
}
- /*
- * We can't depend on SCSI devices being available after loading
- * one of their modules until scsi_complete_async_scans() is
- * called and the resume device usually is a SCSI one.
- */
- scsi_complete_async_scans();
-
swsusp_resume_device = name_to_dev_t(resume_file);
if (!swsusp_resume_device) {
error = -ENODEV;
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 91b0fd021a95..4ed81e74f86f 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -24,7 +24,6 @@
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/freezer.h>
-#include <scsi/scsi_scan.h>
#include <asm/uaccess.h>
@@ -84,7 +83,6 @@ static int snapshot_open(struct inode *inode, struct file *filp)
* appear.
*/
wait_for_device_probe();
- scsi_complete_async_scans();
data->swap = -1;
data->mode = O_WRONLY;