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7fb57a019f
Rework the locking and lifecycle management in the cdc-acm driver. Instead of using a global mutex to prevent the 'acm' object from being freed, use the tty_port kref to keep the device alive when either the USB side or TTY side is still active. This allows us to use the global mutex purely for protecting the acm_table, while use acm->mutex to guard against disconnect during TTY port activation and shutdown. The USB-side kref is taken during port initialization in probe(), and released at the end of disconnect(). The TTY-side kref is taken in install() and released in cleanup(). On disconnect, tty_vhangup() is called instead of tty_hangup() to ensure the TTY hangup processing is completed before the USB device is taken down. The TTY open and close handlers have been gutted and replaced with tty_port_open() and tty_port_close() respectively. The driver-specific code which used to be there was spread across install(), activate() and shutdown(). Reported-by: Dave Jones <davej@redhat.com> Cc: Alan Cox <alan@linux.intel.com> Cc: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Havard Skinnemoen <hskinnemoen@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> |
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| .. | ||
| cdc-acm.c | ||
| cdc-acm.h | ||
| cdc-wdm.c | ||
| Kconfig | ||
| Makefile | ||
| usblp.c | ||
| usbtmc.c | ||