The single mutex for the sr module, introduced as a BKL replacement,
globally serialises all sr ioctls, which hurts multi-drive performance.
This patch replaces sr_mutex with per-device mutexes in struct scsi_cd,
allowing concurrent ioctls on different sr devices.
Signed-off-by: Otto Meta
---
T
Paolo Bonzini writes:
> The virtqueue_add_buf function has two limitations:
>
> 1) it requires the caller to provide all the buffers in a single call;
>
> 2) it does not support chained scatterlists: the buffers must be
> provided as an array of struct scatterlist;
Chained scatterlists are a horr
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