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kernel: double READSTR buffer size to 8000 bytes for devusb

--- a/sys/src/9/port/portdat.h

+++ b/sys/src/9/port/portdat.h

@@ -785,7 +785,7 @@

 	NUMSIZE	=	12,		/* size of formatted number */

 	MB =		(1024*1024),

 	/* READSTR was 1000, which is way too small for usb's ctl file */

-	READSTR =	4000,		/* temporary buffer size for device reads */

+	READSTR =	8000,		/* temporary buffer size for device reads */

 };

 extern	Conf	conf;