From: Jia-Ju Bai <baijiaju1990@163.com>
To: nab@linux-iscsi.org, bart.vanassche@sandisk.com,
davem@davemloft.net, hare@suse.com,
elfring@users.sourceforge.net
Cc: linux-scsi@vger.kernel.org, target-devel@vger.kernel.org,
linux-kernel@vger.kernel.org, Jia-Ju Bai <baijiaju1990@163.com>
Subject: [PATCH] iscsi: Fix a sleep-in-atomic bug
Date: Wed, 31 May 2017 11:26:39 +0800 [thread overview]
Message-ID: <1496201199-3661-1-git-send-email-baijiaju1990@163.com> (raw)
The driver may sleep under a spin lock, and the function call path is:
iscsit_tpg_enable_portal_group (acquire the lock by spin_lock)
iscsi_update_param_value
kstrdup(GFP_KERNEL) --> may sleep
To fix it, the "GFP_KERNEL" is replaced with "GFP_ATOMIC".
Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com>
---
drivers/target/iscsi/iscsi_target_parameters.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/target/iscsi/iscsi_target_parameters.c b/drivers/target/iscsi/iscsi_target_parameters.c
index fce6276..8768916 100644
--- a/drivers/target/iscsi/iscsi_target_parameters.c
+++ b/drivers/target/iscsi/iscsi_target_parameters.c
@@ -702,7 +702,7 @@ int iscsi_update_param_value(struct iscsi_param *param, char *value)
{
kfree(param->value);
- param->value = kstrdup(value, GFP_KERNEL);
+ param->value = kstrdup(value, GFP_ATOMIC);
if (!param->value) {
pr_err("Unable to allocate memory for value.\n");
return -ENOMEM;
--
1.7.9.5
next reply other threads:[~2017-05-31 3:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-31 3:26 Jia-Ju Bai [this message]
2017-06-01 6:21 ` [PATCH] iscsi: Fix a sleep-in-atomic bug Nicholas A. Bellinger
2017-06-02 1:13 ` Jia-Ju Bai
2017-06-02 3:20 ` Nicholas A. Bellinger
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