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| author | Arnd Bergmann <arnd@arndb.de> | 2016-01-13 21:25:41 (GMT) |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2016-01-14 10:00:29 (GMT) |
| commit | d50f42384dbfcf5143de614710e132dc06cd2439 (patch) | |
| tree | a47cb5297cd8b7481b5d5496e8915fac2bac6f00 | |
| parent | e10c321977091f163eceedec0650e0ef4b3cf4bb (diff) | |
| download | linux-d50f42384dbfcf5143de614710e132dc06cd2439.tar.xz | |
mmc: tmio_mmc_dma: don't print invalid DMA cookie
The tmio_mmc_start_dma_{rx,tx} function functions contain debug
code that prints the dma cookie among other things. However,
in case we fall back to PIO mode for some reason, the cookie
variable is never initialized, and gcc warns about this:
In file included from ../include/linux/printk.h:277:0,
from ../include/linux/kernel.h:13,
from ../include/linux/list.h:8,
from ../include/linux/kobject.h:20,
from ../include/linux/device.h:17,
from ../drivers/mmc/host/tmio_mmc_dma.c:13:
../drivers/mmc/host/tmio_mmc_dma.c: In function 'tmio_mmc_start_dma':
../include/linux/dynamic_debug.h:86:3: warning: 'cookie' may be used uninitialized in this function [-Wmaybe-uninitialized]
__dynamic_dev_dbg(&descriptor, dev, fmt, \
^
../drivers/mmc/host/tmio_mmc_dma.c:128:15: note: 'cookie' was declared here
dma_cookie_t cookie;
This modifies the dev_dbg() statements so we only print the cookie
when we are already in the DMA path.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
| -rw-r--r-- | drivers/mmc/host/tmio_mmc_dma.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/drivers/mmc/host/tmio_mmc_dma.c b/drivers/mmc/host/tmio_mmc_dma.c index e4b05db..4a0d6b8 100644 --- a/drivers/mmc/host/tmio_mmc_dma.c +++ b/drivers/mmc/host/tmio_mmc_dma.c @@ -94,9 +94,9 @@ static void tmio_mmc_start_dma_rx(struct tmio_mmc_host *host) desc = NULL; ret = cookie; } + dev_dbg(&host->pdev->dev, "%s(): mapped %d -> %d, cookie %d, rq %p\n", + __func__, host->sg_len, ret, cookie, host->mrq); } - dev_dbg(&host->pdev->dev, "%s(): mapped %d -> %d, cookie %d, rq %p\n", - __func__, host->sg_len, ret, cookie, host->mrq); pio: if (!desc) { @@ -116,8 +116,8 @@ pio: "DMA failed: %d, falling back to PIO\n", ret); } - dev_dbg(&host->pdev->dev, "%s(): desc %p, cookie %d, sg[%d]\n", __func__, - desc, cookie, host->sg_len); + dev_dbg(&host->pdev->dev, "%s(): desc %p, sg[%d]\n", __func__, + desc, host->sg_len); } static void tmio_mmc_start_dma_tx(struct tmio_mmc_host *host) @@ -174,9 +174,9 @@ static void tmio_mmc_start_dma_tx(struct tmio_mmc_host *host) desc = NULL; ret = cookie; } + dev_dbg(&host->pdev->dev, "%s(): mapped %d -> %d, cookie %d, rq %p\n", + __func__, host->sg_len, ret, cookie, host->mrq); } - dev_dbg(&host->pdev->dev, "%s(): mapped %d -> %d, cookie %d, rq %p\n", - __func__, host->sg_len, ret, cookie, host->mrq); pio: if (!desc) { @@ -196,8 +196,7 @@ pio: "DMA failed: %d, falling back to PIO\n", ret); } - dev_dbg(&host->pdev->dev, "%s(): desc %p, cookie %d\n", __func__, - desc, cookie); + dev_dbg(&host->pdev->dev, "%s(): desc %p\n", __func__, desc); } void tmio_mmc_start_dma(struct tmio_mmc_host *host, |