Sorry, that test in the end was inverted of course.. it should read
if( (DeviceFD = open( /dev/sdb, O_RDWR )) != ERROR ) {
printf("success\n"); // <== use to work (open R/W)
} else {
printf("failure"); // <== now fails under kernel 5.10
}
I have USB devices that have a write enable/write protect feature.
A vendor specific SCSI command write enables a write protected drive.
In kernels prior to 5.10 I have been able to write-enable the drive
(by sending the vendor specific command to the SCSI generic device)
and then change the read o
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