can: mcp251x: read-modify-write eflag only when needed
Use read-modify-write instead of a simple write to change the register contents, to close existing the race window between the original manual read and write. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Acked-by: Wolfgang Grandegger <wg@grandegger.com>
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