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.
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| @@ -53,7 +53,7 @@ struct sdio_func { · 52 unmodified lines | ||
| 53 | 53 | unsigned int state; /* function state */ |
| 54 | 54 | #define SDIO_STATE_PRESENT (1<<0) /* present in sysfs */ |
| 55 | 55 | |
| 56 | − u8 tmpbuf[4]; /* DMA:able scratch buffer */ | |
| 56 | + u8 *tmpbuf; /* DMA:able scratch buffer */ | |
| 57 | 57 | |
| 58 | 58 | unsigned num_info; /* number of info strings */ |
| 59 | 59 | const char **info; /* info strings */ |