On Tue, Nov 03, 2015 at 03:36:10PM +0530, Vignesh R wrote: > + } > + mutex_lock(&master->mmap_lock_mutex); > + ret = master->spi_mtd_mmap_read(spi, from, len, retlen, buf, > + read_opcode, addr_width, > + dummy_bytes); > + mutex_unlock(&master->mmap_lock_mutex); > + if (master->auto_runtime_pm) > + pm_runtime_put(master->dev.parent); It's a bit worrying that this doesn't sync with the message queue except via the mutex: this means that we might be out of order with respect to any asynchronous transfers that are happening on the device. I'm not sure that this is a practical problem, though there is some risk of unfair scheduling that would have to be under extreme load and it might make sense to prioritise reads anyway.
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