3fb80ef3bc
This is a portability fix and reduces stack usage. The DMA mapping API cannot map on-stack addresses, as explained in Documentation/DMA-mapping.txt. Convert the two cases of on-stack packet payload buffers in firedtv (payload of write requests in avc_write and of lock requests in cmp_lock) to slab-allocated memory. We use the 512 bytes sized FCP frame buffer in struct firedtv for this purpose. Previously it held only incoming FCP responses, now it holds pending FCP requests and is then overwriten by an FCP response from the tuner subunit. Ditto for CMP lock requests and responses. Accesses to the payload buffer are serialized by fdtv->avc_mutex. As a welcome side effect, stack usage of the AV/C transaction functions is reduced by 512 bytes. Alas, avc_register_remote_control() is a special case: It previously did not wait for a response. To fit better in with the other FCP transactions, let it wait for an interim response. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com> |
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| .. | ||
| common | ||
| dvb | ||
| IR | ||
| radio | ||
| video | ||
| Kconfig | ||
| Makefile | ||