In order to use the v1.3 driver for sis1100 with CERN release base upon kernel 2.4.21-32 the following changes are needed  both in sis1100_read_dma.c and sis1100_write_dma.c 

127d126
< /* problems with 2.4.21 (CERN!)
132,137d130
< */
< /* replace with ... */
<     spin_lock_irq(&current->sighand->siglock);
<     sigemptyset(&current->pending.signal);
<     sigfillset(&current->blocked);
<     sigdelset(&current->blocked, SIGKILL);
141,145c134
<     /*problems with 2.4.21 (CERN!)
<      recalc_sigpending(current);
<      replace with ... */
<     recalc_sigpending();
< 
---
>     recalc_sigpending(current);
149c138
<     spin_unlock_irq(&current->sighand->siglock);
---
>     spin_unlock_irq(&current->sigmask_lock);
214d202
< /* problems with 2.4.21 (CERN!)
216,220c204
<     oldset = current->blocked;
< */
< /* replace with ... */
<     spin_lock_irq(&current->sighand->siglock);
<     sigemptyset(&current->pending.signal);
---
>     current->blocked = oldset;
222,225c206
<     /*problems with 2.4.21 (CERN!)
<      recalc_sigpending(current);
<      replace with ... */
<     recalc_sigpending();
---
>     recalc_sigpending(current);
229c210
<     spin_unlock_irq(&current->sighand->siglock);
---
>     spin_unlock_irq(&current->sigmask_lock);