This is a note to let you know that I've just added the patch titled
target: Fix divide by zero bug in fabric_max_sectors for unconfigured devices
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
target-fix-divide-by-zero-bug-in-fabric_max_sectors-for-unconfigured-devices.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From nab@xxxxxxxxxxxxxxx Tue Feb 26 10:03:15 2013
From: "Nicholas A. Bellinger" <nab@xxxxxxxxxxxxxxx>
Date: Tue, 19 Feb 2013 03:15:14 +0000
Subject: target: Fix divide by zero bug in fabric_max_sectors for unconfigured devices
To: target-devel <target-devel@xxxxxxxxxxxxxxx>
Cc: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>, Herton Ronaldo Krzesinski <herton.krzesinski@xxxxxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Message-ID: <1361243714-4765-1-git-send-email-nab@xxxxxxxxxxxxxxx>
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
commit 7a3cf6ca1ab2a2f7161c6dec5a787fc7a5de864e upstream
This patch fixes a possible divide by zero bug when the fabric_max_sectors
device attribute is written and backend se_device failed to be successfully
configured -> enabled.
Go ahead and use block_size=512 within se_dev_set_fabric_max_sectors()
in the event of a target_configure_device() failure case, as no valid
dev->dev_attrib.block_size value will have been setup yet.
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Cc: Herton Ronaldo Krzesinski <herton.krzesinski@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/target/target_core_device.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -1230,6 +1230,8 @@ int se_dev_set_max_sectors(struct se_dev
int se_dev_set_fabric_max_sectors(struct se_device *dev, u32 fabric_max_sectors)
{
+ int block_size = dev->se_sub_dev->se_dev_attrib.block_size;
+
if (atomic_read(&dev->dev_export_obj.obj_access_count)) {
pr_err("dev[%p]: Unable to change SE Device"
" fabric_max_sectors while dev_export_obj: %d count exists\n",
@@ -1267,8 +1269,12 @@ int se_dev_set_fabric_max_sectors(struct
/*
* Align max_sectors down to PAGE_SIZE to follow transport_allocate_data_tasks()
*/
+ if (!block_size) {
+ block_size = 512;
+ pr_warn("Defaulting to 512 for zero block_size\n");
+ }
fabric_max_sectors = se_dev_align_max_sectors(fabric_max_sectors,
- dev->se_sub_dev->se_dev_attrib.block_size);
+ block_size);
dev->se_sub_dev->se_dev_attrib.fabric_max_sectors = fabric_max_sectors;
pr_debug("dev[%p]: SE Device max_sectors changed to %u\n",
Patches currently in stable-queue which might be from nab@xxxxxxxxxxxxxxx are
queue-3.4/target-fix-divide-by-zero-bug-in-fabric_max_sectors-for-unconfigured-devices.patch
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