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usb: mass_storage: align page buffer

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Flash drivers may impose alignment requirements on the destination
buffers due to use of DMA transfers.  In particular Nordic QSPI flash
API requires that addresses, sizes, and buffers all by 4-byte aligned.
Align the page buffer to satisfy this requirement.

Signed-off-by: Peter A. Bigot <pab@pabigot.com>
This commit is contained in:
Peter A. Bigot 2020-04-18 21:34:34 -05:00 • committed by Carles Cufí
commit ebd19ad10b
1 changed files with 4 additions and 1 deletions
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5
subsys/usb/class/mass_storage.c
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@ -113,8 +113,11 @@ static volatile u32_t defered_wr_sz;
* Keep block buffer larger than BLOCK_SIZE for the case
* the dCBWDataTransferLength is multiple of the BLOCK_SIZE and
* the length of the transferred data is not aligned to the BLOCK_SIZE.
*
* Align for cases where the underlying disk access requires word-aligned
* addresses.
*/
static u8_t page[BLOCK_SIZE + CONFIG_MASS_STORAGE_BULK_EP_MPS];
static u8_t __aligned(4) page[BLOCK_SIZE + CONFIG_MASS_STORAGE_BULK_EP_MPS];
/* Initialized during mass_storage_init() */
static u32_t memory_size;