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brcmfmac: prevent possible deadlock on resuming SDIO device.

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When the system is resumed a deadlock can occur when DPC gets
entered before resume is complete. This patch fixes this by
properly checking the suspend state outside the claim_host code
block.

Reviewed-by: Arend Van Spriel <arend@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Daniel (Deognyoun) Kim <dekim@broadcom.com>
Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Hante Meuleman 2015-01-25 20:31:31 +01:00 committed by Kalle Valo
parent 5ef1e60419
commit 69d03ee0b7
3 changed files with 18 additions and 35 deletions
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33
drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
View File

@ -97,25 +97,6 @@ static void brcmf_sdiod_dummy_irqhandler(struct sdio_func *func)
{
}
static bool brcmf_sdiod_pm_resume_error(struct brcmf_sdio_dev *sdiodev)
{
bool is_err = false;
#ifdef CONFIG_PM_SLEEP
is_err = atomic_read(&sdiodev->suspend);
#endif
return is_err;
}
static void brcmf_sdiod_pm_resume_wait(struct brcmf_sdio_dev *sdiodev,
wait_queue_head_t *wq)
{
#ifdef CONFIG_PM_SLEEP
int retry = 0;
while (atomic_read(&sdiodev->suspend) && retry++ != 30)
wait_event_timeout(*wq, false, HZ/100);
#endif
}
int brcmf_sdiod_intr_register(struct brcmf_sdio_dev *sdiodev)
{
int ret = 0;
@ -244,10 +225,6 @@ static int brcmf_sdiod_request_data(struct brcmf_sdio_dev *sdiodev, u8 fn,
brcmf_dbg(SDIO, "rw=%d, func=%d, addr=0x%05x, nbytes=%d\n",
write, fn, addr, regsz);
brcmf_sdiod_pm_resume_wait(sdiodev, &sdiodev->request_word_wait);
if (brcmf_sdiod_pm_resume_error(sdiodev))
return -EIO;
/* only allow byte access on F0 */
if (WARN_ON(regsz > 1 && !fn))
return -EINVAL;
@ -462,10 +439,6 @@ static int brcmf_sdiod_buffrw(struct brcmf_sdio_dev *sdiodev, uint fn,
unsigned int req_sz;
int err;
brcmf_sdiod_pm_resume_wait(sdiodev, &sdiodev->request_buffer_wait);
if (brcmf_sdiod_pm_resume_error(sdiodev))
return -EIO;
/* Single skb use the standard mmc interface */
req_sz = pkt->len + 3;
req_sz &= (uint)~3;
@ -516,10 +489,6 @@ static int brcmf_sdiod_sglist_rw(struct brcmf_sdio_dev *sdiodev, uint fn,
if (!pktlist->qlen)
return -EINVAL;
brcmf_sdiod_pm_resume_wait(sdiodev, &sdiodev->request_buffer_wait);
if (brcmf_sdiod_pm_resume_error(sdiodev))
return -EIO;
target_list = pktlist;
/* for host with broken sg support, prepare a page aligned list */
__skb_queue_head_init(&local_list);
@ -1077,8 +1046,6 @@ static int brcmf_ops_sdio_probe(struct sdio_func *func,
#endif
atomic_set(&sdiodev->suspend, false);
init_waitqueue_head(&sdiodev->request_word_wait);
init_waitqueue_head(&sdiodev->request_buffer_wait);
brcmf_dbg(SDIO, "F2 found, calling brcmf_sdiod_probe...\n");
err = brcmf_sdiod_probe(sdiodev);

18
drivers/net/wireless/brcm80211/brcmfmac/sdio.c
View File

@ -2609,6 +2609,21 @@ static int brcmf_sdio_intr_rstatus(struct brcmf_sdio *bus)
return ret;
}
static int brcmf_sdio_pm_resume_wait(struct brcmf_sdio_dev *sdiodev)
{
#ifdef CONFIG_PM_SLEEP
int retry;
/* Wait for possible resume to complete */
retry = 0;
while ((atomic_read(&sdiodev->suspend)) && (retry++ != 50))
msleep(20);
if (atomic_read(&sdiodev->suspend))
return -EIO;
#endif
return 0;
}
static void brcmf_sdio_dpc(struct brcmf_sdio *bus)
{
u32 newstatus = 0;
@ -2619,6 +2634,9 @@ static void brcmf_sdio_dpc(struct brcmf_sdio *bus)
brcmf_dbg(TRACE, "Enter\n");
if (brcmf_sdio_pm_resume_wait(bus->sdiodev))
return;
sdio_claim_host(bus->sdiodev->func[1]);
/* If waiting for HTAVAIL, check status */

2
drivers/net/wireless/brcm80211/brcmfmac/sdio.h
View File

@ -169,8 +169,6 @@ struct brcmf_sdio_dev {
u32 sbwad; /* Save backplane window address */
struct brcmf_sdio *bus;
atomic_t suspend; /* suspend flag */
wait_queue_head_t request_word_wait;
wait_queue_head_t request_buffer_wait;
struct device *dev;
struct brcmf_bus *bus_if;
struct brcmfmac_sdio_platform_data *pdata;