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net: wirelesse: wcn36xx: pull allocation outside of critical section

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Commit [3469adb3: fix potential NULL pointer dereference] introduced
a check of msg_ind allocation, but omitted allocation of msg_ind->msg.
Moreover, it introduced two if statements, which looked a bit clunky.

This commit moves allocation code outside of the critical section so
there's no need to dance around mutex_unlock, and adds the missing
allocation check.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Michal Nazarewicz
2013-12-11 17:43:39 +01:00
committed by John W. Linville
parent 623c43875f
commit 90accd0b47
1 changed files with 20 additions and 14 deletions
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34
drivers/net/wireless/ath/wcn36xx/smd.c
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@@ -2060,22 +2060,28 @@ static void wcn36xx_smd_rsp_process(struct wcn36xx *wcn, void *buf, size_t len)
case WCN36XX_HAL_OTA_TX_COMPL_IND: case WCN36XX_HAL_OTA_TX_COMPL_IND:
case WCN36XX_HAL_MISSED_BEACON_IND: case WCN36XX_HAL_MISSED_BEACON_IND:
case WCN36XX_HAL_DELETE_STA_CONTEXT_IND: case WCN36XX_HAL_DELETE_STA_CONTEXT_IND:
mutex_lock(&wcn->hal_ind_mutex);
msg_ind = kmalloc(sizeof(*msg_ind), GFP_KERNEL); msg_ind = kmalloc(sizeof(*msg_ind), GFP_KERNEL);
if (msg_ind) { if (!msg_ind)
msg_ind->msg_len = len; goto nomem;
msg_ind->msg = kmalloc(len, GFP_KERNEL); msg_ind->msg_len = len;
memcpy(msg_ind->msg, buf, len); msg_ind->msg = kmalloc(len, GFP_KERNEL);
list_add_tail(&msg_ind->list, &wcn->hal_ind_queue); if (!msg_ind->msg) {
queue_work(wcn->hal_ind_wq, &wcn->hal_ind_work); kfree(msg_ind);
wcn36xx_dbg(WCN36XX_DBG_HAL, "indication arrived\n"); nomem:
} /*
mutex_unlock(&wcn->hal_ind_mutex); * FIXME: Do something smarter then just
if (msg_ind) * printing an error.
*/
wcn36xx_err("Run out of memory while handling SMD_EVENT (%d)\n",
msg_header->msg_type);
break; break;
/* FIXME: Do something smarter then just printing an error. */ }
wcn36xx_err("Run out of memory while handling SMD_EVENT (%d)\n", memcpy(msg_ind->msg, buf, len);
msg_header->msg_type); mutex_lock(&wcn->hal_ind_mutex);
list_add_tail(&msg_ind->list, &wcn->hal_ind_queue);
queue_work(wcn->hal_ind_wq, &wcn->hal_ind_work);
mutex_unlock(&wcn->hal_ind_mutex);
wcn36xx_dbg(WCN36XX_DBG_HAL, "indication arrived\n");
break; break;
default: default:
wcn36xx_err("SMD_EVENT (%d) not supported\n", wcn36xx_err("SMD_EVENT (%d) not supported\n",