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It is supposed to be under /usr/src/kernels/2.6.9-42.EL.i686/drivers/usb/serial/usbserial.c
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That is correct if you have installed the kernel-devel and kernel-headers rpm packages.
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but after I installed the kernel source rpm (and actually all the source rpms of the RHEL 4 U4 distribution
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Did you prep the kernel source after installing????, this is required for example;
cd /usr/src/redhat/SPECS
rpmbuild -bp --target i686 kernel-2.6.spec
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, I couldn't know where should I find the code usbserial.c ... Any idea where can I find it ?
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After prepping the source it will be found in the /usr/src/redhat/BUILD directory structure.