Alan Cox wrote: > > The claim method takes the mutex, checks if it is NULL and acts > accordingly but it releases the mutex, which makes it useless as the code > then uses port->func. If I move the release of the mutex to the > release_func method then that fixes almost all cases. > > The one I'm stuck on is this > > > CPU1 CPU2 > > > sdio_uart_irq > sdio_uart_port_remove > port->func = NULL; > sdio_in > BUG_ON
This is actually happening? sdio_claim_host()/sdio_release_host() act like a mutex so sdio_uart_port_remove() will wait in sdio_claim_host() until sdio_uart_irq() returns (SDIO interrupt handlers are called with the host claimed). David -- David Vrabel, Senior Software Engineer, Drivers CSR, Churchill House, Cambridge Business Park, Tel: +44 (0)1223 692562 Cowley Road, Cambridge, CB4 0WZ http://www.csr.com/ Member of the CSR plc group of companies. CSR plc registered in England and Wales, registered number 4187346, registered office Churchill House, Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ, United Kingdom -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
