diff options
| author | Heiner Kallweit <hkallweit1@gmail.com> | 2017-03-29 20:54:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-08 10:26:08 +0200 |
| commit | 727a153435fa431c3c99cf5718976bdb73702d06 (patch) | |
| tree | 8b7729920b8c6666361e8624501c59980c5bed26 /drivers | |
| parent | 8f9bd136b50b15e1ddf12281b34802e948023619 (diff) | |
mmc: sdio: fix alignment issue in struct sdio_func
[ Upstream commit 5ef1ecf060f28ecef313b5723f1fd39bf5a35f56 ]
Certain 64-bit systems (e.g. Amlogic Meson GX) require buffers to be
used for DMA to be 8-byte-aligned. struct sdio_func has an embedded
small DMA buffer not meeting this requirement.
When testing switching to descriptor chain mode in meson-gx driver
SDIO is broken therefore. Fix this by allocating the small DMA buffer
separately as kmalloc ensures that the returned memory area is
properly aligned for every basic data type.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Tested-by: Helmut Klein <hgkr.klein@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/core/sdio_bus.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c index 86f5b3223aae..d56a3b6c2fb9 100644 --- a/drivers/mmc/core/sdio_bus.c +++ b/drivers/mmc/core/sdio_bus.c @@ -266,7 +266,7 @@ static void sdio_release_func(struct device *dev) sdio_free_func_cis(func); kfree(func->info); - + kfree(func->tmpbuf); kfree(func); } @@ -281,6 +281,16 @@ struct sdio_func *sdio_alloc_func(struct mmc_card *card) if (!func) return ERR_PTR(-ENOMEM); + /* + * allocate buffer separately to make sure it's properly aligned for + * DMA usage (incl. 64 bit DMA) + */ + func->tmpbuf = kmalloc(4, GFP_KERNEL); + if (!func->tmpbuf) { + kfree(func); + return ERR_PTR(-ENOMEM); + } + func->card = card; device_initialize(&func->dev); |